US3976676A
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Polysiloxane compounds containing hydroxyl groups
Assignee: Novartis Corp
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Filing: 1975-03-17
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Granted: 1976-08-24
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Expires: 1995-03-17
Abstract
Abstract Polysiloxanes containing hydroxyl groups are manufactured by reacting polysiloxanes containing alkoxy groups with aliphatic or cycloaliphatic-alipatic diols in the presence of a catalyst at elevated temperatures. The new polysiloxanols can be used as modifiers for organic resins, such as urethane resins or epoxide resins, and give flexible hydrophobic plastics having valuable mechanical properties.
Inventors
- 👤 Friedrich Lohse
- 👤 Heinz Rembold
- 👤 Dieter Baumann
- 👤 Kurt Munk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C07F7/0838; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4085; C08G77/04; C08G77/38; C08G77/382; C08G77/388
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
A polysiloxane of formula I ##EQU6## wherein R 1 and R 2 each denote a methyl, ethyl, propyl or phenyl and R 1 and R 2 on the same Si atom denote identical substituents and within the siloxane chain denote different substituents, R 3 denotes an alkylene with 2-6 C atoms, a lower alkyl-substituted alkylene with 2-6 C atoms in the alkylene chain or a cycloaliphatic-aliphatic residue and n denotes a number from 2 to 20.
Claim 2
Dependent Claim
76 words
A polysiloxane of formula I ##EQU6## wherein R 1 and R 2 each denote a methyl, ethyl, propyl or phenyl and R 1 and R 2 on the same Si atom denote identical substituents and within the siloxane chain denote different substituents, R 3 denotes an alkylene with 2-6 C atoms, a lower alkyl-substituted alkylene with 2-6 C atoms in the alkylene chain or a cycloaliphatic-aliphatic residue and n denotes a number from 2 to 20.
Claim 3
Dependent Claim
39 words
A polysiloxane according to claim 1 which is a polymethylphenylsiloxanesdiol or a polypropylphenylsiloxanediol, wherein R 3 denotes a lower alkyl-substituted alkylene with 3 C atoms in the alkylene chain, obtained by removing a primary and a secondary hydroxyl group.
Claim 4
Dependent Claim
19 words
A polysiloxane according to claim 1 which is a polymethylphenylsiloxanediol, wherein R 3 denotes the 1-propyl-2-ethylpropylene or 1-propyl-2,2-dimethylpropylene residue.
Claim 5
Dependent Claim
40 words
A polysiloxane according to claim 1 wherein R 1 and R 2 are each methyl on one silicon atom and are each phenyl on the alternate silicon atom in the polysiloxane chain, R 3 denotes 1-propyl-2-ethylpropylene, and n denotes 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |